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Most decoders now report total sample play time, now. Technically, this breaks binary compatibility with the 1.0 branch, since it extends the Sound_Sample struct, but most (all?) programs are just passing pointers allocated by SDL_sound around, and might be okay. Source-level compatibility is not broken...yet! :) --ryan. -------- Original Message -------- Subject: SDL_sound patch: Finding total length of time of sound file. Date: Sun, 26 Jan 2003 09:31:17 -0800 (PST) Hi Ryan, I am working with Eric Wing and helping him modify SDL_sound. AS part of our efforts in improving and enhancing SDL_sound, we like to submit this patch. We modified the codecs to find the total time of a sound file. Below is the explanation of the patch. The patch is appended as an attachment to this email. * MOTIVATION: We needed the ability to get the total play time of a sample (And we noticed that we're not the only ones). Since SDL_sound blocks direct access to the specific decoders, there is no way for a user to know this information short of decoding the whole thing. Because of this, we believe this will be a useful addition, even though the accuracy may not be perfect (subject to each decoder) or the information may not always be available. * CONTRIBUTORS: Wesley Leong (modified the majority of the codecs and verified the results) Eric Wing (showed everyone how to do modify codec, modified mikmod) Wang Lam (modified a handful of codecs, researched into specs and int overflow) Ahilan Anantha (modified a few codecs and helped with integer math) * GENERAL ISSUES: We chose the value to be milliseconds as an Sint32. Milliseconds because that's what Sound_Seek takes as a parameter and -1 to allow for instances/codecs where the value could not be determined. We are not sure if this is the final convention you want, so we are willing to work with you on this. We also expect the total_time field to be set on open and never again modified by SDL_sound. Users may access it directly much like the sample buffer and buffer_size. We thought about recomputing the time on DecodeAll, but since users may seek or decode small chunks first, not all the data may be there. So this is better done by the user. This may be good information to document. Currently, all the main codecs are implemented except for QuickTime.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 08 May 2004 08:19:50 +0000
parents 2d887640d300
children
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[This version of timidity has been stripped for simplicity in porting to SDL,
and then even further for SDL_sound]
---------------------------------*-text-*---------------------------------

        From http://www.cgs.fi/~tt/discontinued.html :

        If you'd like to continue hacking on TiMidity, feel free. I'm
        hereby extending the TiMidity license agreement: you can now 
        select the most convenient license for your needs from (1) the
        GNU GPL, (2) the GNU LGPL, or (3) the Perl Artistic License.  

--------------------------------------------------------------------------

        This is the README file for TiMidity v0.2i

	TiMidity is a MIDI to WAVE converter that uses Gravis
Ultrasound(*)-compatible patch files to generate digital audio data
from General MIDI files. The audio data can be played through any
sound device or stored on disk. On a fast machine, music can be
played in real time. TiMidity runs under Linux, FreeBSD, HP-UX, SunOS, and
Win32, and porting to other systems with gcc should be easy.

	TiMidity Features:

	* 32 or more dynamically allocated fully independent voices
	* Compatibility with GUS patch files
	* Output to 16- or 8-bit PCM or uLaw audio device, file, or
          stdout at any sampling rate
	* Optional interactive mode with real-time status display
	  under ncurses and SLang terminal control libraries. Also
          a user friendly motif interface since version 0.2h
	* Support for transparent loading of compressed MIDI files and
	  patch files

	* Support for the following MIDI events:
	  - Program change
	  - Key pressure
	  - Channel main volume
	  - Tempo
	  - Panning
	  - Damper pedal (Sustain)
	  - Pitch wheel
	  - Pitch wheel sensitivity
	  - Change drum set

* The GNU General Public License can, as always, be found in the file
  "../COPYING".

* TiMidity requires sampled instruments (patches) to play MIDI files. You
  should get the file "timidity-lib-0.1.tar.gz" and unpack it in the same
  directory where you unpacked the source code archive. You'll want more
  patches later -- read the file "FAQ" for pointers.

* Timidity is no longer supported, but can be found by searching the web.


                        Tuukka Toivonen <toivonen@clinet.fi>

[(*) Any Registered Trademarks used anywhere in the documentation or
source code for TiMidity are acknowledged as belonging to their
respective owners.]